Leukemia Clinical Trial
Official title:
A Case-Control Study of Pesticides and Childhood Leukemia
NCT number | NCT00342888 |
Other study ID # | 999902030 |
Secondary ID | 02-C-N030 |
Status | Completed |
Phase | |
First received | |
Last updated | |
Start date | October 30, 2001 |
Verified date | December 12, 2023 |
Source | National Institutes of Health Clinical Center (CC) |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Observational |
Childhood leukemia is the most common type of childhood cancer and its etiology is largely unknown. Most case-control studies of childhood leukemia have reported elevated risks among children whose parents were occupationally exposed to pesticides or who used pesticides in the home or garden. Investigators at the University of California at Berkeley (UCB) conducted a case-control study of childhood leukemia in 35 counties in the San Francisco Bay area and the agricultural Central Valley of California. A major focus of the UCB study is to evaluate whether household or occupational exposure to pesticides increases the risk of childhood leukemia. Our collaboration provided additional funding to collect carpet dust samples for the measurement of pesticides and other chemicals. For 470 participants, we attempted to collect carpet dust using a special high volume small surface sampler (HVS3) vacuum and by taking dust from participants vacuum cleaner. As of July 2006, dust samples will be collected only from participant's vacuum cleaner. Samples were collected at a home visit approximately 3-6 months after the first in-person interview. We will also provide support for mapping of the crops (i.e., determining crop field boundaries and crop species) within 1200 meters (3/4 mile) of residences so that the residential proximity to agricultural fields treated with pesticides can be determined. We will conduct the epidemiologic analysis of pesticide and other chemical levels in carpet dust and risk of childhood leukemia. We will also evaluate whether residential proximity to agricultural pesticide use is associated with risk of leukemia. Further, we will conduct an Exposure Pilot Study that will include a subset of the study population. Two components of the Pilot Study will evaluate how well a used vacuum bag and a window sill wipe predict pesticide and other chemical concentrations in carpet dust samples collected with the more complicated HVS3 vacuum method. The third component will compare pesticides detected in carpet dust with pesticides predicted by geographic proximity to agriculture....
Status | Completed |
Enrollment | 629 |
Est. completion date | |
Est. primary completion date | |
Accepts healthy volunteers | No |
Gender | All |
Age group | N/A to 8 Years |
Eligibility | - INCLUSION CRITERIA: All cases and controls were selected from participants in the UCB case-control study who have completed the Tier I interview. Study population is limited to children. All races and ethnicities will be included in the study. Tier I: The cases eligible for participation in Tier I of the UCB study of all newly diagnosed cases of childhood leukemia 0-14 years old resident in 35 counties in San Francisco Bay Area and the Central Valley Further inclusion criteria are no prior cancer diagnosis and at least one English or Spanish speaking parent. Tier II: Tier II participants will be selected from cases and controls that complete the Tier I interview. Cases (and their match controls), aged 0-7, diagnosed from December 1, 1999 through 2003, and who still reside at the home where they were living ate the diagnosis date, will be eligible for the Tier II interview. |
Country | Name | City | State |
---|---|---|---|
United States | University of California, Berkeley | Berkeley | California |
Lead Sponsor | Collaborator |
---|---|
National Cancer Institute (NCI) |
United States,
Deziel NC, Rull RP, Colt JS, Reynolds P, Whitehead TP, Gunier RB, Month SR, Taggart DR, Buffler P, Ward MH, Metayer C. Polycyclic aromatic hydrocarbons in residential dust and risk of childhood acute lymphoblastic leukemia. Environ Res. 2014 Aug;133:388-95. doi: 10.1016/j.envres.2014.04.033. Epub 2014 Jun 17. — View Citation
Metayer C, Colt JS, Buffler PA, Reed HD, Selvin S, Crouse V, Ward MH. Exposure to herbicides in house dust and risk of childhood acute lymphoblastic leukemia. J Expo Sci Environ Epidemiol. 2013 Jul;23(4):363-70. doi: 10.1038/jes.2012.115. Epub 2013 Jan 16. — View Citation
Ward MH, Colt JS, Metayer C, Gunier RB, Lubin J, Crouse V, Nishioka MG, Reynolds P, Buffler PA. Residential exposure to polychlorinated biphenyls and organochlorine pesticides and risk of childhood leukemia. Environ Health Perspect. 2009 Jun;117(6):1007-13. doi: 10.1289/ehp.0900583. Epub 2009 Jan 27. — View Citation
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | odds ratios for exposures to environmental contaminants and other factors related to childhood leukemia. | childhood leukemia | Data analysis still ongoing | |
Primary | factors associated with concentrations of chemicals including pesticides and persistent organochlorines in house dust samples | concentrations of the chemicals | Data analysis still ongoing |
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